transactionManager does not roll back transaction on Exception

[satfaltu]

Below are codes from my xml file

<bean id="testDao" class="myapp.TestImpl">
	<property name="dataSource" ref="myDataSource" />
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
	<property name="dataSource" ref="myDataSource" />
</bean>
<bean id="testDaoProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
	<property name="proxyInterfaces">
		<list>
			<value>
				myapp.TestDao
			</value>
		</list>
	</property>
	<property name="target">
		<ref bean="testDao" />
	</property>
	<property name="transactionManager">
		<ref bean="transactionManager" />
	</property>
	<property name="transactionAttributes">
		<props>
			<prop key="*">
				PROPAGATION_REQUIRED,-Exception
			</prop>
		</props>
	</property>
</bean>

and TestImpl.java

public class TestImpl extends SimpleJdbcDaoSupport implements TestDao{
	public void insertTest(List<String> list) throws Exception {
		for (String string : list) {
			getJdbcTemplate().update("insert into testTab(pcode) values(?)", new Object[]{string});
		}
	}
}

The List<String> contains 4 values. First 3 values are good but the 4th value violates PK constraint. I expected that the transaction will roll back and no insertion will be done. But it not working - first 3 insertions are done. Any help?